Figure 45.
Fourteen percent off-center fed antenna.
3. The inverted L antenna. The inverted L antenna (figures 46, 50)
is a half wave or a quarter wave in length. It is end fed. It uses
a single wire feed that can be a quarter wave in length, or may be
connected directly to the whip binding post.
The impedance of an
inverted L is 2500 ohms.
An antenna tuning unit is needed to load
this antenna, or the transmitter must be able to load antennas over a
wide impedance range.
A counterpoise may be used to reduce ground
absorption.
The counterpoise should be 3 to 4 inches above ground
using tent pegs.
However, the antenna will perform without the
counterpoise.
The counterpoise ensures that the ground reflected
wave is not absorbed but adds to the direct wave.
68
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